I have a few lines of code, which goes like this.

Query cmSbmQuery =createQuery(" from CmSbmHdr sbmHdr where sbmHdr.accountId = :acctId and sbmHdr.billPeriodEndDate>:sbmEndDate and sbmHdr.billPeriodEndDate<:sbmStartDate");

cmSbmQuery.bindId("acctId", accountId) ;
cmSbmQuery.bindDate("sbmEndDate", sbmEndDate);
cmSbmQuery.bindDate("sbmStartDate", sbmStartDate);

cmSbmQuery.addResult("billSbmDttm", "sbmHdr.billDateTime");

cmSbmQuery.orderBy("billSbmDttm", Query.DESCENDING);

in this what does bindId, bindDate, addResult do?